1. Edit /etc/vsftpd.conf as follow.
/etc/vsftpd.conf

chroot_local_user=NO
chroot_list_enable=YES
chroot_list_file=/etc/vsftpd.chroot_list

 

2. Create the /etc/vsftpd.chroot_list and enter the usernames which you want to jail.
/etc/vsftpd.chroot_list

userA
userB
userC
...

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